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小木虫论坛-学术科研互动平台 » 材料区 » 金属 » 非晶合金 » 【原创】热烈庆祝蒋敏强获得英国《哲学》Maxwell青年论文奖
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hslining

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拜读一下

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amannnn(金币+2,VIP+0):谢谢分享 4-14 21:51
Energy dissipation in fracture of bulk metallic glasses via inherent competition between local softening and quasi-cleavage

Authors: M. Q. Jiang a;  Z. Ling a;  J. X. Meng a; L. H. Dai
Affiliation:   
a State Kay Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100080, China
DOI: 10.1080/14786430701864753
Publication Frequency: 36 issues per year
Published in: Philosophical Magazine, Volume 88, Issue 3January 2008 , pages 407 - 426
Subjects: Ceramics & Glasses; Composites; Condensed Matter Physics; Crystallography; Materials Science; Metals & Alloys; Nanoscience & Nanotechnology; Polymers & Plastics;
Formats available: HTML (English) : PDF (English)
You have: FREE ACCESS
Also incorporating: Philosophical Magazine Series 7
Article Requests: Order Reprints : Request Permissions
View Article: View Article (PDF) View Article (HTML) View Article Section-at-a-time (HTML)
Abstract
Compression, tension and high-velocity plate impact experiments were performed on a typical tough Zr41.2Ti13.8Cu10Ni12.5Be22.5 (Vit 1) bulk metallic glass (BMG) over a wide range of strain rates from ∼10-4 to 106 s-1. Surprisingly, fine dimples and periodic corrugations on a nanoscale were also observed on dynamic mode I fracture surfaces of this tough Vit 1. Taking a broad overview of the fracture patterning of specimens, we proposed a criterion to assess whether the fracture of BMGs is essentially brittle or plastic. If the curvature radius of the crack tip is greater than the critical wavelength of meniscus instability [F. Spaepen, Acta Metall. 23 615 (1975); A.S. Argon and M. Salama, Mater. Sci. Eng. 23 219 (1976)], microscale vein patterns and nanoscale dimples appear on crack surfaces. However, in the opposite case, the local quasi-cleavage/separation through local atomic clusters with local softening in the background ahead of the crack tip dominates, producing nanoscale periodic corrugations. At the atomic cluster level, energy dissipation in fracture of BMGs is, therefore, determined by two competing elementary processes, viz. conventional shear transformation zones (STZs) and envisioned tension transformation zones (TTZs) ahead of the crack tip. Finally, the mechanism for the formation of nanoscale periodic corrugation is quantitatively discussed by applying the present energy dissipation mechanism.

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11楼2009-04-07 13:52:54
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allenfu

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洛阳学子(金币+1,VIP+0):多谢交流,这种现象确实比较常见 4-29 23:04
洛阳学子(金币+1,VIP+0):多谢交流,这种现象确实比较常见 4-29 23:04
咋就在国内做不出来结果呢
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12楼2009-04-07 15:50:54
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yztian

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我也收到邮件了，羡慕啊，我的文章还悬着呢，过来沾喜气！
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13楼2009-04-07 19:59:26
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collins0623

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恭喜恭喜呀！牛呀！
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14楼2009-04-07 23:02:28
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monicajing
恭喜恭喜！牛！
15楼2009-04-08 07:17:06
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whh1235068

木虫 (小有名气)
厉害，向蒋老师学习！！
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追求卓越！
16楼2009-04-08 11:00:24
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zfguo

木虫 (正式写手)
哲学这个杂志还是很不错的~
恭喜~
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我们恨贪官，又拚命报考公务员；我们骂垄断，又削减脑袋往高薪单位钻；我们讥讽不正之风，自己办事却忙找关系。总之，我们愤怒，不是因为觉得不公平，而是觉得.
17楼2009-04-08 19:36:58
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niuben2007
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18楼2009-04-14 20:43:46
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yjs618

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洛阳学子(金币+1,VIP+0):鼓励新虫 4-29 23:04
啥也不说了 跟贴
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令狐冲：“有些事本身我们无法控制，只好控制自己！”
19楼2009-04-16 14:41:59
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monodrama

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洛阳学子(金币+1,VIP+0):鼓励新虫 4-29 23:05
热烈祝贺！
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20楼2009-04-17 15:52:35
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